<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <!-- 添加角色按钮区 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区域 -->
            <!-- stripe 隔行变色 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <!-- <pre>
                            {{scope.row}}
                        </pre> -->
                        <!-- 栅格系统布局组件 el-row 将每一行分为24列 -->
                        <el-row :class="['bdbottom', i1 ===0 ? 'bdtop' : '', 'vcenter']"
                            v-for="(item1, i1) in scope.row.children" :key="item1.id">
                                <!-- 渲染一级权限 -->
                                <el-col :span="5">
                                    <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                                    <i class="el-icon-caret-right"></i>
                                </el-col>
                                <!-- 渲染二级权限 -->
                                <el-col :span="19">
                                    <!-- 通过for循环 嵌套渲染二级权限 -->
                                    <el-row :class="[ i2 ===0 ? '' : 'bdtop', 'vcenter']"
                                    v-for="(item2, i2) in item1.children" :key="item2.id">
                                        <el-col :span="6">
                                            <el-tag type="success" closable
                                            @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                                            <i class="el-icon-caret-right"></i>
                                        </el-col>
                                        <el-col :span="13">
                                            <el-tag v-for="(item3) in item2.children"
                                            :key="item3.id" type="warning" closable
                                            @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                                        </el-col>
                                    </el-row>
                                </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting"
                        @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        <!-- 分配权限的对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%" @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightlist" :props="treeProps"
            show-checkbox node-key="id" default-expand-all
            :default-checked-keys="defKeys" ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
  data () {
    return {
      // 所有角色列表数据
      rolelist: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightlist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        children: 'children',
        label: 'authName'
      },
      // 默认选中节点Id值数组
      defKeys: [],
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色数据
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败！')
      }
      this.rolelist = res.data
      console.log(this.rolelist)
    },
    async removeRightById (role, rightId) {
      // 弹框提示用户是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // console.log('删除成功')
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败失败！')
      }
      // this.getRolesList()
      // 防止当前列表刷新
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 获取所有权限数据
      const { data: res } = await this.$http.get('rights/tree')
      this.setRightDialogVisible = true
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败！')
      }
      // 把获取到的权限数据保存到 data 中
      this.rightlist = res.data
      console.log(this.rightlist)
      // 递归获取三级节点Id
      this.getLeafKeys(role, this.defKeys)

      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的id,并保存到defKeys数组中
    getLeafKeys (node, arr) {
      // 如果当前 node 节点不包含 children 属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item =>
        this.getLeafKeys(item, arr))
    },
    setRightDialogClosed () {
      // 监听分配权限对话框的关闭事件
      this.defKeys = []
    },
    async allotRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      // console.log(keys)
      // 对数组 keys 进行字符串拼接
      const idstr = keys.join(',')

      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idstr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }
      this.$message.success('分配权限成功！')
      this.getRolesList()

      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
    margin: 7px;
}

.bdtop {
    border-top: 1px solid #eee;
}

.bdbottom {
    border-bottom: 1px solid #eee;
}

.vcenter {
    display: flex;
    align-items: center;
}
</style>
